Smoke-consuming furnace



(No Mode l.)

G. W. DAVISSON.

SMOKE GONSUMING FURNACE.

No. 288,554. Patented Nov. 13,1883.

/ Q, [64 wwovaQ/q/m /wywm UNITED STATES PATENT OFFICE.

GEORGE VlflDAVISSON, OF ST. LOUIS, MISSOURI.

S-MOKE-CONSUM IN G FURNACE.

SPECIFICATION forming part of Letters Patent .No. 288,554, dated November 13, .1883,

Application filed August 22, 1883.

To all whom it may concern:

- Be it known that I, GEORGE W. DAVISSON,

of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvementin Smoke-Consuming Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and in which Figure 1 is a side elevation of a furnace, part broken away, showing my improvement applied. Fig. 2 is a vertical transverse section taken on line 2 2, Fig. 1; and Fig. 3 is a similar view taken on line 3 3, Fig. 1.

tudinally by a perforated partition, A, in

which, per so, I make no claim as inventor.

0 represents a chamber behind or in the bridge-wall, which is provided with doors 0, and is preferably covered by a perforated plate, 0 as shown.

D D represent pipes or tubes forming a communication between the upper portion of the rear part of the combustion-chamber and the chamber 0. I have showntwo of these pipes, one for each side of the furnace; but

i of course one alone could be used, doing half the work of both. In all furnaces as ordinarily or always constructed a certain amount of smoke and a great amount of the cold light gases rise and lodge in the extreme upper part of the combustion-chamber,between'the boiler and. the side walls of the furnace; and it is the object of my invention to transfer or take these back to where there is sufficient heat and fire to consume all or the greater part thereof. The rear ends of the pipes, it

(No model.)

will be seen, communicate with these portions of the combustion-chamber, passing out through the back wall of the furnace, from there downward a certain distance, and then forward beneath the combustion-chamber to the chamber 0. The draft of the furnace is sufficient to draw these gases, &c., from this part of the combustion-chamber to the chamber C; and in order that sufficient oxygen may be mixed with the gases to cause thorough combustion thereof, I perforate the pipes, as at D, Fig. 1, so that oxygen is sucked in and mixed with the gases.

The chamber 0 and perforated cover or plate 0 could bedispensed with and the pipes discharge directly into the combustionchamber, but by their use the gases, 8rd, are more evenly distributed across the entire width of thefurnace, and therefore a more thorough combustion is liable to take place. The course of the main products of combustion, which pass through the boiler-fines and escape, is shown by full arrows, and the course of the light gases, &c., that are carried back, is shown by nonfeathered arrows.

The back ends of the pipes D should extend forward into the combustion-chamber past the back ends of the boiler, so that the gases, &c., will be drawn therethrough instead of through the boiler-flues, and a'blower or suction fan or like artificial means is not required to assist the natural draft of the furnace to force the gases through the pipe or pipes.

I claim as my invention- In combination with a furnace, the pipe or pipes forming a communication between the upper portion of the rear end of the sides of the combustionchamber, in front of and above the smokechamber, and the front part of the combustion-chamber, the rear ends of the pipes extending into the furnace past the rear end of the boiler, so that only the natural draft of the furnace is required to compel the gases, 850., to pass through the pipe or pipes,

as set forth.

GEORGE W. DAVISSON. In presence of GEO. H. KNIGHT, EDW. E. IsRAEL' 

